EKN1A11 Economics 1A Exam Notes

EKN1A11 Economics 1A is typically the first serious, quantitative encounter many students have with how economists model choices, markets, and the behaviour of households, firms, and the government. In South African universities, this course often blends microeconomic foundations (demand, supply, elasticity, consumer and producer surplus, market structures in simplified form) with macroeconomic building blocks (national income identities, inflation/unemployment basics, and the role of fiscal/monetary policy). These exam notes focus on the knowledge and exam techniques that consistently earn marks: definitions written precisely, diagrams interpreted correctly, and calculations shown step-by-step with clear assumptions.

Throughout these notes, examples are embedded in a South African context (bread/wage pressures, electricity and transport costs, and policy debates that affect local prices and growth). The emphasis is on how to apply theory under exam conditions—how to move from a word problem to a model, and from a model to correct numerical answers and interpretations.

Section 1: Core Economic Thinking for EKN1A11 (Scarcity, Choice, and Models)

Economic concepts that are always examinable

Most EKN1A11 exam papers reward students who can distinguish between what economists assume and what the real world does. The core set of concepts below tends to appear in short questions, long questions, and problem-solving sections.

1) Scarcity and opportunity cost

• Scarcity means resources are limited relative to unlimited wants.
• Opportunity cost is the value of the next-best alternative forgone when a choice is made.

Exam technique: When asked about opportunity cost, always mention “the next-best alternative” and avoid confusing it with “money paid” (which is only part of the true cost).

Example (South African context):
If a student uses R2,000 per month for transport, the opportunity cost is not only the R2,000 spending but the alternative (e.g., using that money for textbooks, airtime, or savings). In a firm context, an opportunity cost is often the value of owner’s time or capital in its next-best use.

2) Economic models and assumptions

Economists use models to simplify reality. Models typically include:

• Variables: measurable factors (price, income, quantity).
• Parameters: fixed constants in a given model (taste coefficients, technology).
• Assumptions: conditions under which the model holds (e.g., “all else equal”).

Exam technique: If a question asks “explain the effect of an increase in X,” you must state the mechanism (e.g., higher income increases demand via purchasing power), not only the direction (left/right or up/down).

3) Positive vs normative statements

• Positive: describes how things are (testable).
• Normative: argues how things should be (value judgment).

Example:

• Positive: “A carbon tax increases the price of petrol.”
• Normative: “The carbon tax is desirable because it protects the environment.”

How to interpret economic graphs (diagrams are marks)

Many marks are gained (and lost) in diagram interpretation. EKN1A11 diagrams commonly include supply and demand (possibly with shifts), market equilibrium, and sometimes surplus concepts.

Demand and supply curves: the “logic chain”

For each curve, memorise:

• Demand curve slopes downward: lower price → higher quantity demanded (other things equal).
• Supply curve slopes upward: higher price → higher quantity supplied (other things equal).

Equilibrium occurs where:
[
Q_d = Q_s
]
At equilibrium:

• No shortage or surplus.
• Market price is stable given the model’s assumptions.

Shifts vs movements along curves

A frequent exam error is mixing these up.

• Movement along a curve: caused by a change in the variable on the axis (e.g., price changes → you move along demand).
• Shift of the curve: caused by a change in a determinant other than price (e.g., income changes → demand shifts).

Example: Income change and demand shift

• If income rises (assuming normal good), demand increases:
  • Demand curve shifts right
  • Equilibrium price and quantity generally rise

South African exam scenario:
If food prices rise and households’ incomes are constrained, demand for certain categories (like higher-priced cuts of meat) may fall, shifting demand left for those goods.

Elasticity: conceptual grounding for later calculations

Elasticity measures how responsive one variable is to changes in another.

Price elasticity of demand (PED)

[
E_d = \frac{%\Delta Q_d}{%\Delta P}
]

• Usually negative by convention; many exam solutions use absolute value (magnitude).

Interpretations:

• (|E_d| > 1): elastic demand
• (|E_d| < 1): inelastic demand
• (|E_d| = 1): unit elastic

Exam technique: If you’re asked “is demand elastic?” you must connect it to the slope and the proportional change. When using graphs alone, remember: a steeper curve often implies lower elasticity (but numerical elasticity must be calculated from data).

Cross elasticity and income elasticity (often brief but tested)

• Income elasticity of demand
  [
  E_y = \frac{%\Delta Q}{%\Delta Y}
  ]

  • Positive → normal good
  • Negative → inferior good

• Cross elasticity of demand
  [
  E_{xy} = \frac{%\Delta Q_x}{%\Delta P_y}
  ]

  • Positive → substitutes
  • Negative → complements

Why this matters: Even if the exam asks only for one elasticity type, the course expects you to understand that elasticity is about proportional responsiveness, not just direction.

The circular flow and basic macro intuition

Although EKN1A11 Economics 1A is often micro-heavy, the macro foundations are still crucial.

Circular flow of income (basic structure)

The circular flow diagram (households ↔ firms ↔ government ↔ foreign sector) helps explain:

• Where money flows between agents.
• How taxes and government spending affect spending and income.

Leakages and injections (intuition)

• Leakages: savings, taxes (in a simplified model)
• injections: investment, government spending
• In equilibrium in a simplified macro framework, injections = leakages.

Exam technique: If the question asks about policy effects, describe through leakages/injections and then mention the demand-side channel (increased spending raises aggregate demand).

Section 2: Demand, Supply, Equilibrium, and Market Outcomes (with South African applications)

Demand determinants and how to model them

Demand for a good depends on many factors besides its own price. Common determinants include:

• Income (Y)
• Prices of related goods (substitutes and complements)
• Tastes and preferences
• Expectations about future prices and income
• Number of buyers
• Population demographics and advertising intensity

Normal vs inferior goods

• If income increases and demand increases: normal good.
• If income increases and demand decreases: inferior good.

South African example idea:
Some basic transport options or cheaper staple foods may behave like inferior goods in certain income groups: when real income rises, people may substitute to more expensive alternatives.

Substitutes and complements

• Substitutes: cross elasticity positive
• Complements: cross elasticity negative

Example:
If the price of public transport tickets rises, demand for informal transport alternatives may rise (substitute). If the price of data bundles decreases, demand for smartphones or apps may rise (complements in consumer spending bundles, depending on the specific goods considered).

Supply determinants and what shifts them

Supply depends on:

• Input prices (wages, raw materials, energy)
• Technology
• Taxes/subsidies
• Number of sellers
• Expectations
• Regulation and compliance costs

The role of energy and input costs (highly relevant locally)

In South Africa, electricity prices, fuel costs, and wage adjustments can significantly influence supply. If input costs increase:

• Marginal costs rise
• Supply shifts left (or upward in price terms)

Exam technique: If a question provides a scenario like “input prices increase,” immediately state how the supply curve shifts and predict changes in equilibrium price and quantity.

Equilibrium and comparative statics (predicting direction)

Comparative statics asks: “If X changes, what happens to equilibrium price and quantity?”

Procedure for exam answers

When you see a scenario:

1. Identify the market (what good?).
2. Identify the determinant that changes (income, input cost, tastes, tax, etc.).
3. Decide whether demand or supply shifts.
4. Predict the direction of shift (left/right).
5. Use standard equilibrium logic to infer changes in price and quantity.
6. If elasticity is relevant, mention that the magnitude depends on elasticities.

Example 1: Increase in demand

Suppose demand increases for maize meal because of population growth.

• Demand shifts right.
• Equilibrium price rises.
• Equilibrium quantity rises.

Example 2: Increase in input costs

Suppose wages rise for bakers’ labour.

• Supply shifts left.
• Equilibrium price rises.
• Equilibrium quantity falls.

Key exam point: Even though both price and quantity respond, you must state the correct combination:

• Left shift in supply → price up, quantity down.
• Right shift in supply → price down, quantity up.

Taxes, subsidies, and their incidence (who really pays)

Taxes and subsidies are core exam topics because they combine modelling with interpretation of welfare effects.

Specific tax (per unit)

Let a tax be imposed per unit sold. In supply-demand diagrams:

• Supply effectively shifts upward by the tax amount (in price terms).
• Equilibrium adjusts.

Tax incidence depends on elasticities:

• More inelastic side pays a larger share of the tax.

Exam technique: If the question provides “demand is inelastic” or “supply is inelastic,” explicitly state which side bears more of the tax and justify using elasticity logic.

Subsidy

A subsidy lowers the cost to producers:

• Supply shifts right (or effectively supply curve moves downward).
• Equilibrium price to consumers falls.
• Equilibrium quantity increases.

Consumer surplus, producer surplus, and deadweight loss

These welfare concepts often appear as diagram-based or calculation-based questions.

Definitions

• Consumer surplus (CS): difference between willingness to pay and market price (area under demand above price).
• Producer surplus (PS): difference between market price and willingness to accept (area above supply below price).
• Deadweight loss (DWL): welfare loss due to inefficiency, commonly from taxation or price controls where the market doesn’t reach equilibrium.

How to calculate with simple linear functions

In standard textbook settings:

• Demand: (P = a – bQ)
• Supply: (P = c + dQ)

If equilibrium quantity is found by setting (a – bQ = c + dQ), then:

• CS and PS correspond to triangle areas.

Example template (for your exam practice):

1. Solve equilibrium (Q^) and (P^).
2. Compute CS and PS using:
   • Triangle area formula: (\frac{1}{2}\times \text{base}\times \text{height})
3. If a tax causes a wedge, compute new quantities and price changes.

Do not skip steps: Many students lose marks because they jump straight to welfare without confirming equilibrium quantities.

Numerical practice: elasticity computation (common form)

EKN1A11 often includes calculations using point elasticity or arc elasticity. A common approach is arc elasticity for larger changes:

[
E_d = \frac{(Q_2 – Q_1)/\left(\frac{Q_1 + Q_2}{2}\right)}{(P_2 – P_1)/\left(\frac{P_1 + P_2}{2}\right)}
]

Step-by-step exam method

1. List (Q_1, Q_2, P_1, P_2).
2. Compute (%\Delta Q) using average quantity.
3. Compute (%\Delta P) using average price.
4. Divide to get elasticity magnitude.
5. Interpret elastic vs inelastic.

Common interpretation marks:

• If demand is elastic, a price increase raises revenue? Actually:
  • With elastic demand, raising price reduces total revenue.
  • With inelastic demand, raising price increases total revenue.

Make sure you use the correct revenue rule:
[
TR = P \times Q
]

Mini case studies: applying the model to South African-like scenarios

Case Study A: Petrol price shock and substitution

• If petrol prices rise:
  • Demand for petrol falls (movement along demand).
  • Some consumers shift to alternatives (public transport, carpooling, informal transport).
• This may shift demand for petrol left (tastes/alternatives change) if substitutes become more attractive.

Exam angle: Connect short-run vs long-run elasticities.

• Short-run: more inelastic (people can’t instantly change jobs/vehicles).
• Long-run: more elastic (people can relocate, change vehicle, purchase more efficient cars).

Case Study B: Bread and wheat input cost increase

If wheat input costs rise:

• Supply shifts left.
• Bread prices rise.
• Quantity decreases.

Exam angle: Consider whether bread is a necessity (often relatively inelastic demand), meaning price increases can be large relative to quantity changes.

Case Study C: VAT changes and demand response (tax)

If a consumption tax increases the effective price:

• Demand shifts along (higher price).
• Market equilibrium changes.
• Welfare declines (deadweight loss if the tax distorts quantity).

Exam angle: Identify who bears the tax burden and relate to elasticity.

Section 3: Market Failures, Government Intervention, and Welfare Economics

Why markets sometimes fail: the exam “taxonomy”

EKN1A11 frequently tests your ability to explain why intervention may be justified. The major market failures usually expected include:

• Externalities (positive and negative)
• Public goods and the free-rider problem
• Market power (monopoly/oligopoly) and inefficiencies
• Information failure and asymmetric information
• Inequality and merit/demerit goods (sometimes framed as equity concerns)

Because the course is “Economics 1A,” the explanations may be introductory rather than fully advanced, but you must still link market failure → inefficiency → policy tool → welfare impact.

Externalities: the clearest path to marks

Negative externality (e.g., pollution)

A negative externality means:

• Social cost > private cost
• Firms/consumers do not fully account for external harm

In a diagrammatic sense:

• The efficient output occurs where social marginal cost (SMC) intersects demand.
• A private market outcome may produce more than the efficient quantity.

Exam language checklist:

• Define externality.
• State that private decision-making ignores external costs or benefits.
• Identify the direction: overproduction for negative externalities.

Policy tools for negative externalities

Common tools:

1. Pigouvian tax equal to the marginal external damage.
2. Regulation/standards (e.g., emissions limits).
3. Tradable permits (cap-and-trade; sometimes mentioned qualitatively).

Exam technique: If asked “how does a tax work,” say:

• It increases private costs
• Internalises the external cost
• Reduces quantity towards efficient level

Positive externality (e.g., education, vaccination)

• Social marginal benefit > private marginal benefit
• Market may underprovide the good

Policy tools:

• Subsidies to consumers or producers
• Direct provision or support programs

Public goods and the free-rider problem

A public good has:

• Non-excludability: it’s hard to prevent someone from using it.
• Non-rivalry: one person’s use doesn’t reduce availability for others.

Free-rider problem: people benefit without paying, causing underprovision.

Exam response structure (high scoring):

1. Define public good with both features.
2. Explain free rider behaviour.
3. State market outcome: underprovision.
4. Explain government solution: taxes, funding, direct provision.

South African illustration (qualitative):
Community infrastructure and certain public services can exhibit public-good characteristics. Even if the exact classification varies by service, the exam expects your reasoning about excludability and rivalry.

Market power (monopoly): inefficiency and deadweight loss

If markets are not perfectly competitive, firms can set prices above marginal cost, leading to:

• Higher prices
• Lower quantities
• Deadweight loss

Core idea:
In perfect competition, price tends to equal marginal cost (in simple models). In monopoly, price > marginal cost.

Exam technique: If asked to compare competitive and monopoly outcomes:

• Mention consumer surplus and producer surplus changes.
• Mention deadweight loss (inefficiency).

Information failure: adverse selection and moral hazard (intro)

Even at first-year level, you may be asked to define information problems.

Asymmetric information

One party knows more than the other. Outcomes can be inefficient.

Adverse selection (pre-contract)

• Happens before a transaction.
• Example structure: “Only high-risk buyers sign up” because the insurer cannot tell who is risky.

Moral hazard (post-contract)

• Happens after a transaction.
• Example: “Insurance makes individuals take less care.”

Policy tool ideas (brief but correct):

• Insurance contracts with deductibles/co-payments (reduces moral hazard)
• Screening/verification (reduces adverse selection)

Price controls: ceilings and floors (and their consequences)

Price ceilings

If government sets a maximum price below equilibrium:

• Usually creates excess demand (shortage)
• Quantity supplied falls, demand rises

Exam language:
Explain shortage, rationing, and possibly non-price mechanisms (queues, informal payments in extreme cases).

Price floors

If government sets a minimum price above equilibrium:

• Excess supply (surplus)
• Some form of subsidy or stock-holding may be needed

South African context:
Price floor policies can be linked (conceptually) to agricultural support schemes or labour-related minimum wage discussions. The exam usually tests your ability to reason through supply/demand effects rather than evaluate specific political choices.

Cost-benefit thinking: efficiency vs equity

Even if the course is technical, policy questions often require:

• Efficiency: maximising total surplus
• Equity: fairness distribution concerns

Exam technique:
If asked whether government intervention is “good,” mention both:

• Efficiency impact (welfare, deadweight loss, efficiency gains)
• Equity impact (who gains/loses)

Section 4: Intro Macroeconomics Foundations for EKN1A11 (National Income, Inflation, Unemployment, Policy)

National income accounting: the exam identities

EKN1A11 may include basic national income calculations or explanations. The most common identity you must master is:
[
Y = C + I + G + (X – M)
]
Where:

• Y = Gross Domestic Product (GDP) or national income (in expenditure approach)
• C = consumption
• I = investment
• G = government spending
• X = exports
• M = imports

Other expressions you might see

In factor/income approach:
[
GDP = \text{payments to factors of production} + \text{taxes – subsidies (depending on definitions)}
]
But for first-year exams, the expenditure approach is often dominant.

Worked macro example (consistent numerical method)

Suppose an exam question provides:

• (C = 800)
• (I = 200)
• (G = 150)
• (X = 120)
• (M = 100)

Then:
[
Y = 800 + 200 + 150 + (120 – 100) = 800 + 200 + 150 + 20 = 1,170
]

Exam technique: Always show the arithmetic clearly and keep units consistent (Rand millions, billions, etc.).

Inflation: causes and measurement basics

What inflation means

• Inflation = general increase in the price level over time.
• Measured using price indices (CPI is common).

Types of inflation (intro level)

• Demand-pull inflation: aggregate demand exceeds potential output.
• Cost-push inflation: input costs rise (e.g., fuel, wages, imports).
• Inflation expectations: if people expect higher inflation, wages/prices adjust accordingly.

Real vs nominal values

• Nominal: measured in current prices.
• Real: adjusted for inflation.

If asked to interpret “real income,” explicitly say it removes inflation effects.

South African relevance:
Periods of currency depreciation increase the local price of imported goods. That often appears in exam questions as “imported input costs rise,” leading to cost-push inflation.

Unemployment: how to reason about the labour market

EKN1A11 typically does not require deep labour economics, but you should understand:

• Unemployment can be cyclical or structural.
• The labour force includes those willing and able to work.

Exam-friendly explanations

• Cyclical unemployment relates to insufficient aggregate demand.
• Structural unemployment relates to mismatched skills/location and changes in industry composition.

Economic growth: simple definition and drivers

Economic growth is the increase in output (often measured by GDP growth).

Drivers commonly mentioned:

• Capital accumulation (investment)
• Labour force growth
• Technology and productivity
• Institutional factors and investment climate

Fiscal policy: government spending and taxation

Expansionary fiscal policy

• Increase (G)
• Or reduce taxes (increase disposable income and consumption)

Mechanism (intro):

• Higher government spending increases aggregate demand.
• Lower taxes increase consumption spending (depending on marginal propensity to consume).

Contractionary fiscal policy

• Reduce (G)
• Or increase taxes

Exam technique: If asked about likely effects on GDP, inflation, and unemployment, you must connect via demand and output gap logic:

• In the short run, higher demand tends to raise output and may increase inflation if capacity constraints exist.

Monetary policy: interest rates and the money/credit channel

At first-year level, monetary policy is often discussed via:

• Central bank interest rates
• Credit conditions
• Inflation targeting (conceptually)

Exam-friendly chain:

1. Central bank changes interest rate.
2. Borrowing costs change.
3. Investment and consumption influenced through credit.
4. Aggregate demand and inflation respond.

Aggregate demand and supply intuition (if included)

Even without full AD-AS models, exam questions may ask:

• What happens to output and prices when aggregate demand rises?
• What happens when supply shocks occur?

Core results to remember:

• Demand shifts can raise output and inflation in the short run.
• Supply shocks (e.g., oil price rise) can raise prices while reducing output.

South African exam scenario idea:
Fuel price increase → transport costs rise → business costs rise → prices rise (inflation), output may be squeezed (reduced demand for real goods).

Section 5: Exam Preparation for EKN1A11 — Problem-Solving, Diagram Mastery, and Common Marking-Scheme Patterns (UJ-style university skills)

How to structure answers to maximise marks

A typical Economics 1A exam rewards clarity, correct modelling, and coherent explanation. You can think of marking as:

• Method marks (did you set up the correct model/identity/diagram?)
• Accuracy marks (did your calculations produce correct numbers?)
• Interpretation marks (did you explain what the result means?)
• Presentation marks (diagrams labelled, units shown)

The “4-part” answer framework

For most problem questions:

1. Identify the concept (demand/supply, equilibrium, elasticity, CS/PS, macro identity).
2. Set up the model (equations or diagram shifts).
3. Calculate/solve (show arithmetic clearly).
4. Interpret (direction and welfare implications).

Example of interpretation that earns marks:
“Because demand is relatively inelastic, the tax burden falls more on consumers; total surplus decreases due to deadweight loss.”

Diagram checklist: labels and consistent axes

When you draw a diagram in a timed exam:

• Include axes with correct labels:
  • Price (P) on vertical axis
  • Quantity (Q) on horizontal axis
• Clearly draw both curves.
• Label equilibrium point as (E) or ((P^, Q^)) if required.
• Show shift direction with arrows.
• If asked for welfare, shade:
  • Consumer surplus (CS) area
  • Producer surplus (PS) area
  • Deadweight loss (DWL) triangle/region

Common diagram mistakes:

• Forgetting “other things equal.”
• Shading the wrong side of price line.
• Claiming “supply curve shifts because price changed” (that’s movement along the curve).

Multiple-choice and short-answer strategies

For definitions

Write definitions using:

• Key term
• Essential features
• One link to implication (e.g., “externalities cause market outcomes that are not socially efficient”).

For elasticity conceptual questions

Always interpret with revenue and incidence implications where relevant.

Worked exam-style elasticity and welfare problems (complete templates)

Template A: PED calculation and interpretation

Given:

• (P_1 = 10), (P_2 = 12)
• (Q_1 = 100), (Q_2 = 90)

Compute arc elasticity:

1. Average Q: ((100+90)/2 = 95)
2. Percent change in Q: ((90-100)/95 = -10/95 \approx -0.1053) → (-10.53%)
3. Average P: ((10+12)/2 = 11)
4. Percent change in P: ((12-10)/11 = 2/11 \approx 0.1818) → (18.18%)
5. Elasticity: (-0.1053/0.1818 \approx -0.579)

So (|E_d| \approx 0.58) → inelastic demand.

Interpretation:

• Price rises → quantity falls, but total revenue increases (because demand is inelastic).

Template B: CS/PS triangles with linear curves

Assume equilibrium:

• (P^* = 6)
• (Q^* = 50)
  Demand intercept at (P = 10) when (Q=0). Supply intercept at (P=2) when (Q=0).

Then:

• CS height = (10 – 6 = 4)
• CS base = 50
  [
  CS = \frac{1}{2}\times 50 \times 4 = 100
  ]
• PS height = (6 – 2 = 4)
• PS base = 50
  [
  PS = \frac{1}{2}\times 50 \times 4 = 100
  ]

If a tax creates a wedge and changes equilibrium to (P_c=7), (P_p=5) and new quantity (Q_t=40), then:

• CS becomes (\frac{1}{2}\times 40 \times (10-7) = \frac{1}{2}\times 40 \times 3 = 60)
• PS becomes (\frac{1}{2}\times 40 \times (5-2) = \frac{1}{2}\times 40 \times 3 = 60)
• DWL = loss in total surplus:
  • Before: (CS + PS = 200)
  • After: (CS + PS = 120)
  • DWL = 80

Exam technique: Even if you don’t know the exact numbers from the prompt, the method (triangle heights and bases) is what you need. Many students lose method marks by writing “DWL exists” without calculating or correctly identifying the affected region.

Macro exam templates: national income and policy effects

Template C: GDP from expenditure components

Always use:
[
Y = C + I + G + (X – M)
]
Show each component substitution and then simplify.

Template D: Policy effect reasoning

If asked: “Increase in G increases output—explain.”
A full-mark chain:

1. (G) is directly part of GDP identity.
2. Higher (G) increases aggregate demand.
3. In short run, firms respond by increasing output if there is spare capacity.
4. Unemployment may fall.
5. Inflation impact depends on output gap and supply constraints.

Common exam traps and how to avoid them

1. Confusing shift vs movement

   • Price changes move along a curve.
   • Other determinants shift curves.

2. Ignoring “other things equal”

   • If the prompt includes multiple changes, you must specify each effect’s shift direction.

3. Using elasticity without interpreting

   • Calculation without interpretation loses marks.

4. Wrong welfare shading

   • Shade areas relative to correct prices (consumers vs producers).

5. National income identity arithmetic errors

   • Always double-check ((X – M)). Many students add imports instead of subtracting them.

6. Policy reasoning too vague

   • “Government will help” is not enough.
   • Must link to a mechanism: tax/transfer changes incentives and demand; monetary policy changes interest rates/credit; regulation changes behaviour.

Cluster requirement: institution-focused course framing within UJ-style economics preparation

At University of Johannesburg (UJ) and other South African institutions offering Economics 1A modules, the learning emphasis usually corresponds to:

• Micro foundations: markets, price mechanisms, elasticity, and basic welfare.
• Intro macro foundations: national income accounting, inflation/unemployment basics, and policy intuition.

Since EKN1A11 is a module within the Economics 1A pathway, the most effective exam preparation is to practice:

• at least 2–3 full demand/supply diagram questions,
• at least 2 elasticity calculation questions,
• at least 1 welfare-with-tax question,
• at least 1 national income identity question,
• short explanations for market failure and policy tools.

UJ exam success habit: write diagrams fast, label carefully, and connect every diagram to a sentence interpretation. Markers often award interpretation marks even when the diagram is not perfect, but correct diagrams with correct explanation almost always score highest.

Final checklist for the EKN1A11 exam day

Before submitting:

• Diagrams: labelled axes, equilibrium point, shift arrows, correct shading (CS/PS/DWL if asked).
• Calculations: units, arithmetic checked, elasticity sign handled consistently (use absolute value if your course uses magnitude).
• Explanations: always include the mechanism (“because…”) not only the direction.
• Macro identities: correct subtraction of imports, consistent variable definitions.

These notes are designed to be used actively during revision: choose a past paper question (or a practice question from your tutorial guide), attempt it under time pressure, and then compare your modelling steps and diagram logic to the templates above. With repeated practice, the core structures of EKN1A11 become automatic—freeing your time for the specific numbers and scenarios in your exam paper.